Abstract
The relationship between the storm-time ring current and the auroral electrojets is investigated using IMAGE magnetometer data, DSt and H-SYM, and solar wind data. Statistical results as well as the investigation of single events show that the auroral electrojets occur also during nonstorm conditions without storm-time ring current development and even during the storm recovery phase of increasing DSt. A close correlation between electrojet intensity and ring current intensity was not found. Though the eastward electrojet moves equatorward during the storm main phase there is no unequivocal relationship between the movement of the westward electrojet and the ring current development. All these results suggest that the auroral electrojets and the ring current develop more or less independently of each other.Key words: Magnetospheric physics (magnetosphere-ionosphere interactions; storms and substorms)
Highlights
For a long time the question of how close the relationship is between geomagnetic ®eld variations in the auroral zone, in low latitudes and near the equator has been a puzzle
The observations of the IMAGE magnetometer chain have enabled us to investigate the relationship between the auroral electrojets occurrence and the ring current, taking into account the fact that the inuence of the tail current is included in the termring current''
Though the eastward electrojet occurrence has a closer correlation to the ring current than the westward one as was shown for the main phase, such a relationship is not given for the late recovery phase and nonstorm conditions
Summary
For a long time the question of how close the relationship is between geomagnetic ®eld variations in the auroral zone, in low latitudes and near the equator has been a puzzle. Since the 1960s it has been known and accepted that these geomagnetic ®eld variations, which are the most characteristic features of geomagnetic storms, are caused by three-dimensional ionosphericmagnetospheric current systems. One of the most important basic problems of magnetosphere physics and especially of the disturbed magnetosphere is the interrelation between the substorm current system and. The auroral electrojets are the cause of the ring current 3. There is no relationship between ring current and auroral electrojet development though they are caused by one and the same source
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